RTL6

Last updated
RTL6
Identifiers
Aliases RTL6 , Mar6, Mart6, dJ1033E15.2, LDOC1L, leucine zipper, down-regulated in cancer 1-like, leucine zipper, down-regulated in cancer 1 like, LDOC1 like, SIRH3, retrotransposon Gag like 6
External IDs MGI: 2675858 HomoloGene: 18594 GeneCards: RTL6
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_032287

NM_177630

RefSeq (protein)

NP_115663

NP_808298

Location (UCSC) Chr 22: 44.49 – 44.5 Mb Chr 15: 84.44 – 84.44 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

Retrotransposon Gag Like 6 is a protein encoded by the RTL6 gene in humans. [5] RTL6 is a member of the Mart family of genes, which are related to Sushi-like retrotransposons and were derived from fish and amphibians. [6] The RTL6 protein is localized to the nucleus and has a predicted leucine zipper motif that is known to bind nucleic acids in similar proteins, such as LDOC1.

Contents

Gene

Locus

Gene neighborhood of RTL6 on chromosome 22. RTL6 gene neighborhood.gif
Gene neighborhood of RTL6 on chromosome 22.

The gene is on Chromosome 22 (human) at 22q13.31 on the minus strand from 44492570 to 44498125 nt on the GRCh38.p7 assembly of the human genome. Aliases for the gene include LDOC1L, MAR6, MART6, and SIRH3. RTL6 is made up of 2 exons and is encoded by 5556 base pairs of DNA . [7]

Origin

RTL6 is a retrotransposon GAG related gene. It is one of eleven MART (Mammalian Retrotransposon Derived) genes in humans related to Sushi-like retrotransposons with long terminal repeats from fish and amphibians. [6] Between 170 and 310 MYA, MART genes lost their ability to retrotranspose and concomitantly gained new, beneficial function for its host organism. [8]

mRNA

RTL6 has an alternate start of transcription 140 base pairs upstream of the normal transcribed region. The lengths of the primary mRNA and that with the upstream start of transcription are 5355 and 5495 base pairs respectively. [7]

Protein

Primary information

The primary amino acid sequence for RTL6 is made up of 239 residues. [5] There are no known alternative splice variants of the protein. The molecular weight of the protein is 26.2 kDa and the isoelectric point is 11.58. [9] RTL6 is a proline and arginine rich protein. [9]

I-TASSER predicted secondary and tertiary structures for the RTL6 protein.
Immunohistochemical staining of human stomach shows strong nuclear and cytoplasmic positivity in glandular cells. LDOC1L.jpg
I-TASSER predicted secondary and tertiary structures for the RTL6 protein.
Immunohistochemical staining of human stomach shows strong nuclear and cytoplasmic positivity in glandular cells. LDOC1L Stain.png
Immunohistochemical staining of human stomach shows strong nuclear and cytoplasmic positivity in glandular cells.

Domains and motifs

RTL6 contains a predicted leucine zipper motif known to participate in nucleic acid binding in other proteins. [9] RTL6 also contains a domain of unknown function from amino acid residues 98-177 . RTL6 is one of a number of genes belonging to the DUF4939 (domain of unknown function) superfamily. [14]

Secondary structure

The secondary structure of RTL6 is made up of largely alpha helices. [15] One region of RTL6 is also predicted to participate in a coiled-coil structure from amino acid residues 29–63. [14]

Post-translational modifications

There are also two predicted phosphorylation sites for Protein Kinase C with high confidence scores at amino acid residues 6 and 45. [16] [17] There is also a predicted ubiquitination site with medium-confidence at amino acid residue 8. [18]

An annotated schematic of the RTL6 protein showing motifs and predicted phosphorylation and ubiquitination sites. LDOC1L Protein Annotation.png
An annotated schematic of the RTL6 protein showing motifs and predicted phosphorylation and ubiquitination sites.

Cellular sublocation

RTL6 is expected to be localized to the nucleus and cytosol based on the presence of a leucine zipper domain, the absence of signals indicating secretion or transmembrane domains, and immunohistochemical staining. [19] [20] [21]

Expression

RTL6 has been shown to be expressed at high levels during all stages of development and in a wide variety of tissues. [22] [23] [13]

RTL6 expression has been shown to fall in HeLa cervical cancer cells upon treatment with chemotherapeutic Casiopeinas and in A549 lung cancer cells upon treatment with Actinomycin D. [24] [25]

Interacting proteins

RTL6 has been shown to interact with the following proteins:

DDIT3 DNA damage-inducible transcript 3 protein [26]
NXF1 Nuclear RNA export factor 1 [27]
STX18 Syntaxin 18 [28]
MAFF MAF bZIP transcription factor F [28]
GOPC Golgi-associated PDZ and coiled-coil motif-containing protein [28]
BATF3 Basic leucine zipper transcriptional factor ATF-like 3 [28]
TERF2 Telomeric repeat-binding factor 2 [29]
UXACUronate isomerase (Yersinia pestis) [30]

Clinical significance

The RTL6 protein has been shown to interact with the UXAC protein from Yersinia pestis , the gram-negative bacterium responsible for the bubonic plague. [30]

Homology/evolution

Paralogs

Eleven paralogs were identified for RTL6 in humans. The paralogs have diverse functions and expression patterns, although many are known to have zinc finger domains and bind nucleic acids:

MART Family NameAccession NumberSequence LengthQuery CoverPercent Similarity
RTL1 [31] NP_001128360.113581007.6
PEG10 (RTL2) [32] NP_055883.23593535
RTL3 [33] NP_689907.126481002.2
RTL4 [34] NP_001004308.231010019
RTL5 [35] NP_001019626.15693753
RTL6 [5] NP_115663.2239NANA
LDOC1 (RTL7) [36] NP_036449.11463341
RTL8A [37] NP_001071640.11133344
RTL8B [38] NP_001071641.11133343
RTL8C [39] NP_001071639.11133344
RTL9 [40] NP_065820.113882239
RTL10 [41] NP_078903.33643435

Orthologs

RTL6 is highly conserved across mammals, including the leucine zipper motif and DUF4939. The gene is also conserved in marsupials such as the opossum but not in birds such as the chicken, suggesting the gene was likely formed after the divergence of mammals and birds but before the divergence of marsupials and mammals (170-310 MYA: [6]

OrganismCommon NameClassificationAccession NumberPercent IdentityQuery CoverPercent Similarity
Homo sapiens Humans Primate NP_115663.2 [5] NANANA
Macaca mulatta Rhesus Monkey Primate NP_001181372.1 [42] 9810099
Felis catus House Cat Carnivore XP_003989415.1 [43] 9710098
Mus muscalus Common Mouse Rodent NP_808298.2 [44] 9210096
Pteropus alecto Black Flying Fox Bat XP_006917396.1 [45] 9610098
Equus caballus Horse Odd-Toed Ungulates XP_005606827.1 [46] 9510098
Bos Taurus Cattle Even-Toed Ungulates XP_015326927.1 [47] 9410097
Orcinus orca Killer Whale Whales/Dolphins XP_004279624.1 [48] 9510098
Trichechus manatus latirostirs Florida Manatee Placentals XP_004380056.1 [49] 9510096
Erinaceus europaeus European Hedgehog Rabbits/Hares XP_016043235.1 [50] 9310096
Ochotona princeps American Pika Insectivoires XP_004589491.1 [51] 9210097

The most distantly detectable organisms with homology in the gene are bony fishes including salmon and the common carp, but similarity to the human protein sequence is markedly less than that of mammals. No traces of the gene can be seen in intermediates between mammals and bony fishes such as reptiles or amphibians:

OrganismCommon NameClassificationAccession NumberPercent IdentityQuery CoverPercent Similarity
Homo sapiens Humans Primate NP_115663.2 [5] 100100100
Cyprinus carpio Common Carp Bony Fishes XP_018946777 [52] 304134
Esox lucius Northern Pike Bony Fishes XP_019899574.1 [53] 315531
Nothobranchius furzeri Black Rockcod Bony Fishes XP_010767110 [54] 373539

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